claricle · ronaldtse · Jul 27, 2026 · Jul 27, 2026
diff --git a/docs/features/conversion.adoc b/docs/features/conversion.adoc
@@ -32,21 +32,22 @@ svg_to_eps = Vectory::Svg.from_path("diagram.svg").to_eps
 eps_to_svg = Vectory::Eps.from_path("diagram.eps").to_svg
 ----
 
-=== Two-Step Conversions (EPS/PS → SVG)
+=== Direct Conversions (via postsvg)
 
-EPS and PS files are converted to SVG through a PDF intermediate:
-
-1. **EPS/PS → PDF** (via Ghostscript): Preserves BoundingBox information
-2. **PDF → SVG** (via Inkscape): Converts PDF to SVG
+EPS and PS files are converted to SVG directly by the postsvg gem (pure Ruby, no Ghostscript or Inkscape):
 
 [source,ruby]
 ----
-# Two-step conversion (automatic)
 eps = Vectory::Eps.from_path("diagram.eps")
-svg = eps.to_svg  # Internally: EPS → PDF → SVG
+svg = eps.to_svg  # Uses postsvg directly
+
+ps = Vectory::Ps.from_path("diagram.ps")
+svg = ps.to_svg   # Also postsvg
 ----
 
-This two-step process ensures accurate dimension preservation from EPS/PS files.
+postsvg reads the `%%BoundingBox` DSC comment to size the viewBox. Limitations: text/font rendering, image embedding, gradients/patterns, CMYK, and PS Level 2/3 advanced operators are not yet supported by postsvg upstream — EPS/PS files using those features will silently degrade.
+
+=== Two-Step Conversions (EPS/PS → PDF/PS/EMF)
 
 === EMF Conversions (via emfsvg)
 
@@ -73,11 +74,11 @@ emf = Vectory::Svg.from_path("chart.svg").to_emf
 |SVG|EMF|emfsvg gem
 |SVG|PDF|Inkscape
 
-|EPS|SVG|Ghostscript + Inkscape (two-step)
+|EPS|SVG|postsvg gem
 |EPS|PDF|Ghostscript
 |EPS|PS|Via PDF intermediate
 
-|PS|SVG|Ghostscript + Inkscape (two-step)
+|PS|SVG|postsvg gem
 |PS|PDF|Ghostscript
 |PS|EPS|Via PDF intermediate
 

diff --git a/docs/features/index.adoc b/docs/features/index.adoc
@@ -68,23 +68,30 @@ Vectory uses different external tools depending on the source and target formats
 
 === Direct Conversions (via Inkscape)
 
-* **SVG → EPS/PS/EMF/PDF** (via Inkscape export)
-* **EPS/PS/EMF/PDF → SVG** (via Inkscape import)
+* **SVG → EPS/PS/PDF** (via Inkscape export)
+* **PDF → SVG** (via Inkscape import)
 
 Inkscape handles direct conversions to and from SVG format.
 
 === Direct Conversions (via emfsvg)
 
-* **EMF → SVG** (via emfsvg gem)
+* **SVG ↔ EMF** (via emfsvg gem, both directions)
 
-The emfsvg gem provides native EMF to SVG conversion in pure Ruby, with no external tool dependency.
+The emfsvg gem provides bidirectional EMF ↔ SVG conversion in pure Ruby, with no external tool dependency.
+
+=== Direct Conversions (via postsvg)
+
+* **EPS → SVG** (via postsvg gem)
+* **PS → SVG** (via postsvg gem)
+
+The postsvg gem converts PS/EPS to SVG in pure Ruby, with no external tool dependency.
 
 === Two-Step Conversions (via Ghostscript + Inkscape)
 
-* **EPS → PDF → SVG** (Ghostscript for EPS→PDF, Inkscape for PDF→SVG)
-* **PS → PDF → SVG** (Ghostscript for PS→PDF, Inkscape for PDF→SVG)
+* **EPS → PDF → SVG** (legacy path; replaced by postsvg for `Eps#to_svg`)
+* **PS → PDF → SVG** (legacy path; replaced by postsvg for `Ps#to_svg`)
 
-This two-step process preserves BoundingBox information from EPS/PS files.
+EPS/PS → PDF and EPS/PS → PS/EMF (via PDF intermediate) still go through Ghostscript.
 
 === Conversion Tool Matrix
 

diff --git a/docs/getting-started/core-concepts.adoc b/docs/getting-started/core-concepts.adoc
@@ -95,11 +95,12 @@ Vectory uses a flexible conversion pipeline:
 Some conversions are direct:
 * **SVG → EPS/PS/PDF**: Via Inkscape
 * **SVG ↔ EMF**: Via emfsvg (both directions, pure Ruby)
+* **EPS → SVG** and **PS → SVG**: Via postsvg (pure Ruby)
 
 === Two-Step Conversions
 
 Other conversions use an intermediate PDF format:
-* **EPS/PS → PDF → SVG**: Via Ghostscript + Inkscape
+* **EPS/PS → PDF → {PS,EMF}**: Via Ghostscript + Inkscape
 
 This two-step conversion ensures:
 * BoundingBox preservation from EPS/PS

diff --git a/lib/vectory/eps.rb b/lib/vectory/eps.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "postsvg"
+
 module Vectory
   class Eps < Vector
     def self.default_extension
@@ -24,7 +26,7 @@ def to_ps
     end
 
     def to_svg
-      to_pdf.to_svg
+      Svg.from_content(Postsvg.convert(content))
     end
 
     def to_emf

diff --git a/lib/vectory/ps.rb b/lib/vectory/ps.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "postsvg"
+
 module Vectory
   class Ps < Vector
     def self.default_extension
@@ -28,7 +30,7 @@ def to_emf
     end
 
     def to_svg
-      to_pdf.to_svg
+      Svg.from_content(Postsvg.convert(content))
     end
 
     def to_pdf

diff --git a/spec/vectory/eps_spec.rb b/spec/vectory/eps_spec.rb
@@ -94,12 +94,6 @@
           .and_raise(Vectory::ConversionError, "ghostscript failed")
       end
 
-      it "propagates error from to_pdf to to_svg" do
-        expect do
-          eps.to_svg
-        end.to raise_error(Vectory::ConversionError, /ghostscript failed/)
-      end
-
       it "propagates error from to_pdf to to_ps" do
         expect do
           eps.to_ps
@@ -112,29 +106,5 @@
         end.to raise_error(Vectory::ConversionError, /ghostscript failed/)
       end
     end
-
-    context "when Inkscape conversion fails" do
-      before do
-        # Allow ps2pdf to succeed
-        allow(Vectory::GhostscriptWrapper).to receive(:convert)
-          .and_return("fake pdf content")
-
-        # Also make pdf_to_eps fail (used in fallback)
-        allow(Vectory::GhostscriptWrapper).to receive(:pdf_to_eps)
-          .and_raise(Vectory::ConversionError, "Ghostscript fallback failed")
-
-        # Make Inkscape fail
-        converter = instance_double(Vectory::InkscapeWrapper)
-        allow(Vectory::InkscapeWrapper).to receive(:instance).and_return(converter)
-        allow(converter).to receive(:convert)
-          .and_raise(Vectory::ConversionError, "Inkscape failed")
-      end
-
-      it "propagates error from Inkscape to to_svg" do
-        expect do
-          eps.to_svg
-        end.to raise_error(Vectory::ConversionError, /Ghostscript fallback failed/)
-      end
-    end
   end
 end
diff --git a/vectory.gemspec b/vectory.gemspec
@@ -31,6 +31,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "image_size", ">= 3.2.0"
   spec.add_dependency "marcel", "~> 1.0"
   spec.add_dependency "nokogiri", "~> 1.14"
+  spec.add_dependency "postsvg", "~> 0.1"
   spec.add_dependency "thor", "~> 1.0"
   spec.add_dependency "ukiryu", "~> 0.3.0"
 end